Question

how do you know if a number is already a perfect square?

Answer 1

try using a calculator.

Answer 2

a perfect square is something like 1 or 9 because it has a defined sqrt
1*1=1 which means 1 is a perfect square, also means sqrt 1 = 1
3*3 = 9 so, 9 is perfect square, also sqrt 9 = 3

I dont really know what you're asking... but maybe hero or someone else will

Answer 3

See the prime factorization.

Answer 4

If it has a factor that you can multply by itself to get the number

for example 4 has factors 2*2
16 has factors 4*4

144 has factors 12*12

etc...

Answer 5

Or a perfect square would have odd number of factors ..

Answer 6

Fool, don't confuse the poor girl

Answer 7

best thing use calculator as saifoo said

Answer 8

one easy method would be to compute the square root and see if it is an integer ..

Answer 9

Stole my line^

Answer 10

here, have a list of them:

0^2 = 0
1^2 = 1
2^2 = 4
3^2 = 9
4^2 = 16
5^2 = 25
6^2 = 36
7^2 = 49
8^2 = 64
9^2 = 81
10^2 = 100
11^2 = 121
12^2 = 144
13^2 = 169
14^2 = 196
15^2 = 225
16^2 = 256
17^2 = 289
18^2 = 324
19^2 = 361
20^2 = 400

Answer 11

For square root,you could use babylonian method,few other options are here too : http://en.wikipedia.org/wiki/Methods_of_computing_square_roots

Answer 12

such a gr8 question was asked and u guys have spoiled it !!!!!!!!!

Answer 13

@agreene: I always thought that 441 is a perfect square but you list don't have it .. :( ;)

Answer 14

@sheg:what do you mean ?

Answer 15

That's because he stopped at 20

Answer 16

that's too bad :P

Answer 17

He/she ????

Answer 18

lol @FoolforMath... lemme add one more to my list then:
21^2=441

Answer 19

Funny thing is, I went to my calc to compute it, and I saw that it was the last thing I did

Answer 20

@agreene: 625 ? :P

Answer 21

sqrt{441} = 21

Last input on my calc

Answer 22

Random

Answer 23

cheap calc.

Answer 24

93586276
is a perfect square.

Answer 25

Who cares?

Answer 26

who doesnt?

Answer 27

LOL.

Answer 28

Try this 4456320234913445673684992795789043255734373704508753978054948821273035551781300227503267251249

what's it's square root ? ;)

Answer 29

By the way, I wouldn't call a tI-89 a random calc. The other one I have is a TI-Nspire. Neither are cheap

Answer 30

random = cheap

Answer 31

@foolformath
66755675675656565656576748575675675675678567943

Answer 32

Hero is it programmable ?

Answer 33

What the fudge

Answer 34

Yes, both are programmable

Answer 35

@agreene:Do you know that's a prime number ? ;)

Answer 36

TI-89 uses TI-BASIC programming language, it is bulky and dumb and is basically the same as making *.bat programs, but hey... it does come in handy some times.

Answer 37

agreene....and what calculator do you own?

Answer 38

I only have Mathematica ..and it's superb!! ;)

Answer 39

I have 2 89's and a 92

Answer 40

but i generally just use my slide rule... it confuses people and that makes me happy.

Answer 41

What do you need two 89's for? Give it to a kid in need man

Answer 42

well I used to have 92 .. I don't use it anymore .. donated to my brother ..

Answer 43

parallel programming

Answer 44

I have 2 89s because one was my 1st graphing calculator and the other is one of those titanium ones that came out a few years back--grabbed it cause it had direct USB support.

Answer 45

@strawberry_militia:You are a type of strawberry ?

Answer 46

I own the titanium

Answer 47

with Babylonian method, do you always divide by two?

Answer 48

lol no, its my ruby teams nickname.

Answer 49

yes .. It's kind or remind me newton's method ..

Answer 50

Good,I was about to eat you :P

Answer 51

why over 2???

Answer 52

Do you know newton's method ?

Answer 53

no

Answer 54

Actually babylonian method could be derived from newtons' method .. ( http://en.wikipedia.org/wiki/Newton%27s_method)

Answer 55

werent the babylonians before newton??

Answer 56

yes..you are right,newton's method came much later.

Answer 57

Fermat's last theorem was proved only recently but with the aid of mathematics that don't exist at that time ..